Base-fastening device for electrical apparatus.



No. 860,117. PATENTED JULY 1 1907. A

L. BATES, DEOD. M. S. BATES, ADMINISTB-ATRIX. BASE FASTENING DEVICE FORELECTRICAL APPARATUS.

APPLICATION PI LED JULYQ, 1906- v lm/mron A l044z$ Ba/Ze nTa/m rs'W/T/yESSES -o'nrrno-sTA'rns PATENT OFFICE.

I LOUIS BATES, OF. HOBOKEN, NEW JERSEY; MAMIE SIDM-AN BATES,ADMINISTRATRIX OF SAID LOUIS BATES, DECEASED.

BASE-FASTENING DEVICE FOR ELECTRICAL APPARATUS.

Specification of Letters Patent.

Patented 'Ju1 16,1907.

' Application filed July 9,1906- Serial No. 325,225.

To all whomit may concern:

Be it known that I, LOUIS BATES, a citizen of the United States, andresiding at Hoboken, in the county of Hudson and State of New J ersoy,have invented certain new and useful Improvements in Base-FasteningDevices for Electrical Apparatus, of which the following is aspecification, such as will enable those skilled in the art to which itappertains. to make and use the same.

This invention relates to electric switches, cut-outs,

measuring and similar electrical apparatus, and is more partieularlyanimprovement on the devices heretofore used in connection with a nonconductive base plate the different mechanical features which make upthis class of current conveying apparatus, and one object of myinvention is to prevent the accidental formation of an are on the backof such non-conductive base between projecting points of the fasteningdevices, and another object being to provide an effective, cheap andneat device whereby the projecting ends of the fastening material areentirely eliminated, and whereby the rear of the base plate is leftsmooth and unbroken and will ofier no means of accidental shortcircuiting between any of the parts of the devices assembled on thefront part of the same.

The invention is fully disclosed in the following speci fication, ofwhich the accompanying drawing forms a part, in which the separate partsof my improvement are designated by suitable reference characters ineach of the views, and in which;-

Figure l is a plan view of a two pole electric switch; and, Fig. 2 avertical longitudinal section on the line 2-2 of Fig. 1. i

In the drawing a simple two pole switch is employed as the means ofillustrating my invention, in which a is a base plate of non-conductivematerial provided with the line terminals bb and co, non-arcing fuses ddand the usual double knife plate switch e. Screws f, as usual, areemployedto fasten the different features of this switch to the baseplate a. Instead of letting these screws entirely penetrate. the baseplate, as heretofore, and secure the same on the underside got the baseby means of washers and nuts, which procedure does thereby offer thepossibility of the formation of a. short circuiting are between thesepenetrating points,

I provide a drill hole h, which only partly enters into the base platea, as shown in the drawing, and by means of a special tool I undercutthe inner end of the drill hole as seen at i. A suitable metal 9' isentered into the drill hole 12, and of a diameter equal therewith. Thesame is expanded within the enlarged portion 11 of the drill hole bymeans of hydraulic or other power pressure, until this metal entirely,or nearly, fills out the undercut portion t of the drill hole h, whichoperation pre vents the withdrawal of the metal 7' from the same. Thismetal has now the form of a plate, can now be properly centered, drilledand tapped, as seen in the drawing, and serves for the introduction ofthe threaded ends of the screws f. A plate It can thereby be firmlysecured to the base a which will in turn serve to fasten thereto thebinding post m and support a for the fuse d. All the other features ofthe electrical apparatus which are to be assembled on its base can bkfastenedthereto in a similar manner, as illustrated at o and p in Fig. 2of the drawing, which shows the samemanner of fastening the switchproper to the base by means of a countersunk metal plate inserted andexpanded within the non-conductive base. plate a.

v It is obvious that perfect freedom from short circuiting at theside gof the base plate a is hereby attained, and that the attachment of theassembled features is effected in a perfect manner thereby.

It is also apparent that this device canbe employed for any and allkinds of electrical apparatus which depend upon their assemblage upon aunion base. Having fully described my invention, what I claim as new anddesire to secure by Letters Patent, is

In a fastening device tor-the assemblage of various parts of electricalapparatus, a base plate of non-conductlug material provided in one sidewith drill holes which puss only partially thercthrough, said drillholes being enlarged at their inner ends to form chambers or recesses insaid plate, metal plugs secured in said chambers 01' recesses, andscrews passed into said drill holes and secured in said plugs, saidscrews-servingto hold the parts of the electrical apparatus onsaid baseplate.

In testimony that I claim the foregoing as my invention I have signed myname in presence of the subscribing witnesses this 7th dnymt July, 1906.

LOUIS BATES.

Witnesses: i

F. A. S'rnwr n'r, L. E. Momnsnr.

